Shani Pradosh, or Sani Pradosha Vrata, is when Pradosh day dedicated to Lord Shiva falls on Saturday or Shanivar. In 2013, the date of Shani Pradosh are February 23, March 9, November 30 and December 14. In Hinduism, Saturday is dedicated to the worship of Lord Shani or Shaneeshwara – one among the Navagrahas. For those believing in Hindu astrology and horoscope, Lord Shani can create problems in life. It is believed that fasting and praying on Pradosh day will help in keeping removing the effects of Shani.

It is considered highly meritorious to observe puja in a Shiva Temple or Hanuman Temple or Bhairav Temple on Shani Pradosh day.

It is also believed that observing Shani Pradosh will help in getting intelligent and healthy children.

Pradosh, or Pradosham, falls on the 13th day in a traditional Hindu lunar calendar. It is believed that Lord Shiva and Parvati are in playful mood during this period and therefore they will readily fulfill the wishes of the devotees.

There is also a popular belief that people under the bad influence of Lord Shani can escape it by praying to Shiva on the day.